Which of the following about main-sequence stars is FALSE?

For main-sequence stars, bluer stars typically have the longest lifespan

Main-sequence stars always fuse hydrogen

When a main-sequence star runs out of hydrogen, the core contracts and moves off the main-sequence

For main-sequence stars, the hotter the temperature the more massive the star is

Why do younger stars typically live in the spiral arms of galaxies?

The rotation of the spiral arms produces newer stars

Galaxies acquire mass and grow in size, so younger stars form towards the outside

Younger stars are produced in the center but pushed out to the spiral arms

Younger stars need a lot of room in space to form

HI Clouds can be detected from...

21 cm radio line produced by spin-flip transitions

Scientists can hypothesize what happens in a black hole by....

By uniting general relativity and quantum mechanics

We have structures like the ones in the picture due to gravitational collapse, but the luminous mass we see doesn't seem to be enough to create these structures. How then could they form?

Extra gravitational force from dark matter

Primordial black holes started structure formation

There used to be more matter that has since been destroyed

Which of these is NOT evidence of dark matter?

Galaxies in clusters seem to be moving fast enough to escape the cluster but they don't

Galaxy clusters don't seem to have enough luminous mass to contain their hot gas

We see evidence of gravitational lensing

The Milky Way's rotation curve is flat

From lecture 24, we learned that when it was discovered that the Universe was expanding, Einstein conceded his notion. What was his notion?

That the Universe is collapsing

That the nature of the Universe is unknowable

That the Universe was vibrating

How did the CMB go from being infrared radiation when it first appeared to the microwave radiation we see today?

The edge of the Universe cooled down

What happened to the early Universe's quantum fluctuations that solidified upon inflation?

They became the seeds of superclusters

They became primordial black holes

They became the first globular clusters

The Universe is infinite, so how come we can only see out to about 13.8 billion lightyears?

Anything beyond that point is receding faster than the speed of light

There's a "wall" there of radiation, formed before the Universe became transparent

The Universe is infinite, but nothing has formed at those distances yet

Dark energy blots out anything farther away than 13.8 billion light years

What makes the rings in these disks?

The disks formed with those rings

What type of exoplanet tends to be easiest to detect with the transiting and radial velocity methods?

Large ones close to their host star

Small ones far from their host star

Small ones close to their host star

Large ones far from their host star

We're fairly certain about some factors in the Drake equation, but uncertain about others. Rank these in order of certainty, from least to most certain.

Sociological, biological, astronomical

Sociological, astronomical, biological

Biological, sociological, astronomical

Astronomical, biological, sociological

Astro 1500 Final Exam Review 2: Lectures 15-26

Authored by Amanda Weinstein

Physics

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Astro 1500 Final Exam Review 2: Lectures 15-26

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24 questions

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MULTIPLE SELECT QUESTION

30 sec • 1 pt

Where and when is the final going to start?

Physics 3, Monday, December 16, 12 PM

Santa Claus's workshop, Sunday, February 31, Midnight

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element will not produce net energy in stellar fusion?

Hydrogen

Oxygen

Sodium

Iron

Tags

NGSS.HS-ESS1-3

NGSS.HS-ESS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are white dwarfs so hot?

White dwarfs fuse more hydrogen since they are more dense

White dwarfs fuse heavier elements since they are more dense

White dwarfs magnetic field amplifies the heat produced

Because they used to be a star's core

Tags

NGSS.HS-ESS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or False: White Dwarfs and Neutron Stars produce energy through elemental fusion?

True

False

Tags

NGSS.HS-ESS1-3

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Follow up question: Regular Stars counteract gravitational collapse through force of elemental fusion. How do white dwarfs prevent gravitational collapse?

Neutron Degeneracy Pressure

Electron Degeneracy Pressure

Strong Nuclear Force

Magnetic Force

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which spectral type main-sequence star would live the longest?

O-Stars

B-Stars

K-Stars

M-Stars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or False: Out of true stars, O-type stars have the weakest hydrogen lines

True

False

Tags

NGSS.HS-ESS1-3

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